重庆大学学报Issue(12)：103-110,8.DOI:10.11835/j.issn.1000-582X.2013.12.016
挤压态Mg-9Li-3Al-xSr镁合金的微观组织与力学性能
Microstructure and mechanical properties of extruded Mg-9Li-3Al-xSr alloys
摘要
Abstract
The microstructure and mechanical properties of extruded Mg-9Li-3Al-xSr (LA93-xSr ,x=0 ,1 . 5 ,2 .5 ,3 .5 wt% ) alloys are investigated by SEM ,EDS ,XRD ,TEM and mechanical property test .The influence of Sr content on microstructure and mechanical properties the extruded alloys is discussed .The results show that LA93-xSr alloys contain both α-Mg (hcp) andβ-Li (bcc) matrix phases .The effect of Sr on the grain size of the extruded alloys is not significant .The addition of Sr leads to the formation of intermetallic compound (Al4Sr) ,which is mainly distributed along the α/βinterface and appears fibrous structure along the extrusion direction . The mechanical properties of alloys initially enhance and then decrease while the elongation declines with the increase of Sr content .When Sr addition is 2 .5wt% ,the extruded Mg-9Li-3Al-2 .5Sr (LAJ932) alloy exhibits a favorable combination of strength and ductility with an ultimate tensile strength of 235 .2 MPa ,yield strength of 220 .6 MPa and an elongation of 19 .4% . Microstructure evolution during extrusion is governed by deformation induced grain refinement in the α-Mg phase w hereas dynamic recrystallization occurs in the β-Li phase .关键词
镁锂合金/锶/挤压/微观组织/力学性能Key words
Mg-Li alloys/Sr/extrusion/microstructure/mechanical properties分类
矿业与冶金引用本文复制引用
杨艳,彭晓东,李俊辰,谢卫东,魏国兵,魏群义..挤压态Mg-9Li-3Al-xSr镁合金的微观组织与力学性能[J].重庆大学学报,2013,(12):103-110,8.基金项目
国家973计划资助项目 （）
